11859 need swapgs mitigation
Reviewed by: Robert Mustacchi <rm@fingolfin.org>
Reviewed by: Dan McDonald <danmcd@joyent.com>
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Robert Mustacchi <rm@fingolfin.org>

*** 21,30 ****
--- 21,34 ----
  /*
   * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
+ /*
+  * Copyright 2019 Joyent, Inc.
+  */
+ 
  /
  / In-line functions for amd64 kernels.
  /
  
  /
*** 187,204 ****
  
          .inline __set_gs, 0
          movw    %di, %gs
          .end
  
-         /*
-          * OPTERON_ERRATUM_88 requires mfence
-          */
-         .inline __swapgs, 0
-         mfence
-         swapgs
-         .end
- 
  /*
   * prefetch 64 bytes
   */
  
          .inline prefetch_read_many,8
--- 191,200 ----